Headrest



H. E. WEBER July '14, 1931.

HEADREST Filed Nov. 26, 1928 2 Sheets-Sheet I v bilzly if [4 856] H. E. WEBER July 14, 1931.

HEADREST Filed Nov. 26. 1928 2 Sheets-Sheet 2 172/219 Plber I 6mm,

Patented July 14, 1931 UNITED STATES PATENT OFFICE HENRY E. WEBER, OIE CANTON, OHIO, ASSIGNOR TO THE WEBER DENTAL MANUFACTUR- ING COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO HEADREST Application filed November 26, 1928. Serial No. 321,877.

The invention relates'to head rests for dental chairs and the like, and includes common subject matter set forth in my prior application for patent for head rests, filed June 25, 1927,'Seria1 No. 201,435, of which the present application is a continuation in part.

, For attaining maximum usefulness, a dental head rest should be adjustable through'a wide range of positions, so that children as well as adults, of all sizes, may.

use, the same head rest.

'On the other hand, for the proper making and fitting of false teeth, it is essential that the head rest shall maintain vertical the upwardly and. downwardly extending axis of the patients head.

It is equally essential that after the rest pads of the head rest are adjusted for the proper elevation of. the patients head with respect to the seat of the chair, that no movement of the rest pads may occur which shall change the elevation or lateral positions of the rest pads.

For such purposes, head rests including ball and socket joints, or permitting rotation of the rest pads about a vertical axis, are inadequate.

. Accordingly the objects of the present improvements include the provision of a head rest, adapted for use in the foregoing manner, and the parts of which are also arranged'so that the patients hair or the dentists finger is not caught and pulled or pinched during adjustment of the head rest.

These and ancillary objects are attained in the present improvements, a preferred embodiment of which is hereinafter set forth in detail, and is illustrated in the accompanying drawings forming. part hereof, in which Figure 1 is a fragmentary side elevation of a dental chair equipped with the improved head rest hereof, the head rest being adjusted for use by a child;

' Fig. 2, a view similar to Fig. 1, in which the parts of the head rest are shown in full lines in an extreme position of adjustment, and in dot and dash lines in a psiti0l 0f 3 d justment for use by an adult;

ing bracket 2 on the chair 3, and a horizontal shaft 51 is fixed therein as by the pins 5, and the shaft pivotally supports the clamping arm 6 of the improved head rest.

This clamping arm 6 is provided at its lower end with a bearing portion 7 journaled upon the shaft 4, and at its upper end with a similar bearing portion 8 with inwhich is ournaled a horizontal shaft 9.

As illustrated in Figs. 1 and 2, the clamping arm is split longitudinally as shown at I 10, from the bearing portion 7 to the bearing portion 8, and at a point substantially halfway between these bearing portions the arm is out through transversely atone side of the longitudinal central cut, as shown at 11.

As this arm is preferably formed from a malleable casting or the like, the two portions 12 thereof, separated by the transverse cut 11, will have a certain amount of resilience and 'will tend to assume their natural or normal position. To prevent these portions from moving beyond this point, a screw-14 may be extended through a suitable bore at 15 near the free end of each portion 12 and be screwed into the solid portion 16 of the arm.

A bolt 17 is screwed transversely through a threaded aperture in the center of the solid portion 16 of the arm and the bolt may be provided with a lock nut 18 at its outer end. 7 The bolt 17 has a head 19 located in a bore 20 formed in the free ends of the portions 12 and is provided with a flattened'extremity 21 upon which is slidably mounted a collar 22 arranged to be engaged by the cam 23 of a lever 24 which is pivotally mounted as shown at 25 upon the flattened extremity 21 of the boltc17.

It will be seen that when the cam lever 24 i IllOVQd into the position shown in Fig. 1

the collar 22 will be forced inwardly against the free ends of the portions 12 of the arm, bending said portions inwardly toward the solid portion 16 and tightening the bearing portions 7 and 8 of the arm around the horizontal shafts 4 and 9, respectively, clamping these shafts against movement in the bearings.

Supporting arms 26 and 26 are secured, respectively, as by pins 27, upon opposite ends of the horizontal shaft 7 at the sides of the clamping arm 6.

The outer ends of the arm 26 and 26, terminate respectively, in bosses 28 and 28, and the bosses 28 and 28 have formed there in, respectively, coaxial countersunk bores 29 and 29.

The bosses 28 and 28 are located preferably at equal distances from the vertical plane 3030 perpendicular to the horizontal axis of the shaft 9, and passingthrough the midpoint thereof, and the common axis l31 of the boss bores 29 and 29, is preferably horizontal and parallel with the axis of the horizontal shaft 9.

Accordingly, the shaft 9 being parallel with the shaft l, the axis 3131 will always be horizontal and perpendicular to the plane 3030, regardless of the positions of the clamping arm 6 and the supporting arms 26 and 26.

A curved rest pad mounting bar 32, is en larged at its opposite ends 33 and 33, respectively; and threaded sockets 3e and 3a are formed in the ends 33 and 33, respec tively, and receive the threaded inner ends of screws 35 and 35, respectively, which extend through and are journalled in the countersunk bores, respectively, of the bosses 28 and 28.

Washers 36 and 36 are positioned, re spectively, between the bosses 28 and 28 and the adjacent ends 33 and 33, respectively, of the curved rest pad mounting bar 32, in order that the bar may be easily rotated about the axis 3131.

Rest pads 37 and 37 are secured at suitable angles on the bar 32 at equal distances from the plane 3030, and for attaining the objects of the present invention, the horizontal axis of rotation 3131 of the bar 32 and attached rest pads 37 and 37, passes through the centers 38 and 38, respectively, of the rest surfaces 39 and 39, respectively, of the rest pads 37 and 37.

As best illustrated in Figs. 3 and 4, the rest pad mounting bar supporting arms 26 and 26 are curved outwardly in such manner as to permit the bar 32 and attached rest pads to make a complete rotation about their axis 31-31, thus permitting the rest pads to be properly positioned with respect to the patients head regardless of whether the various head rest parts are in the posi- 'f tion illustrated in Fig. 1 for supporting the head of a child patient, or are in any other position.

If the bar 32 and rest pads 37 and 37 were not freely rotatable about their axis, the position illustrated in Fig. 1 could not be attained.

Locating the centers 38 and 38 of the rest surfaces of the rest pads in the axis of rotation 3131 of the rest pads, and stationarily mounting the rest pads on the bar 32, insures that after any adjustment of the head rest for a particular patient, regardless of the number of times the patient may remove hishead from the head rest, his head will always resume substantially the same elevation and position. 4

If the centers of the pad rest surfacesdid not lie in the axis of rotation thereof, such a maintenance of the elevation and position of the patients head could not be attained.

The shafts 7 and 9 being horizontal and parallel with each other as aforesaid, and parallel with the axis of rotation 31-451. of the head rest pads, there is no possibility of movement of the head rest pads about a vertical axis, when the dentist is taking impressions or fitting false, teeth, and thus with the patients back normally resting against the back of the chair, his head is positioned so that his face looks directly forward, and the proper operationsimay be performed.

The arms 26 and 26" are laterally spaced from each other, and are spaced from the bar 32 and rest pa s 37 and 37 so that the patients hair and the dentists fingers will not be caught between the arms and the bar or rest pads during adjustment of the same.

I claim:

1. A head rest including supporting arms, a rest pad mounting member rotatably mounted on ahorizontal axis on the arms rotatable through an arc of 360-", and spaced rest pads stationarily mounted on the member, the axis of rotation of the member passing through the centers of the rest surfaces of the pads.

2. A head rest including a bearing member, a horizontal shaft rotatably mounted in the bearing member, supporting arms secured upon the shaft and rotatable therewith, a rest pad mounting member rotatably mounted on a horizontal axis on the arms rotatable through an arc of 360, the axis of rotation of the mounting member being parallel with the axis of the shaft, and spaced rest pads stationarily mounted on the mounting member, the axis of rotation of the mounting member passing through the centers of the rest surfaces of the pads.

3. A head rest including a supporting bracket, a horizontal shaft secured in the bracket, a clamping arm, one end of the arm being rotatably mounted on the shaft, another shaft parallel with the first shaft and rotatably mounted at the other end of the clamping arm, supporting arms secured upon the second shaft and rotatable therewith, a rest pad mounting member rotatably mounted on a horizontal axis on the arms, rotatable through an arc of 360, the axis of rotation of the member being parallel with the axis of both shafts, and spaced rest pads stationarily mounted on the memher, the axis of rotation of the member assing through the centers of the rest sur aces of the pads.

4. A head rest including a bearing member, a horizontal shaft rotatably mounted in the bearing member, supporting arms secured upon the shaft and rotatable therewith, a rest pad mounting member rotatably mounted on a horizontal axis on the arms and rotatable through an arc of 360, and spaced rest pads stationarily mounted on the mounting member, the axis of rotation of the mounting member being parallel with the axis of the shaft and passing through the centers of the rest surfaces of the pads.

55. A head rest including a supporting bracket, a horizontal shaft secured in the bracket, a clampingarm, one end of the arm being rotatably mounted on the shaft, another shaft parallel with the first shaft and rotatably mounted at the other end of the clamping arm, supporting arms secured upon the second shaft and rotatable therewith, a rest pad mounting member rotatably mounted on a horizontal axis on the arms, and spaced rest pads stationarily mounted on the mounting member, the axis of the rotation of the mounting member being parallel with the axes of both shafts and passing through the centers of the rest surfaces of the pads.

In testimony that I claim the above, I have hereunto subscribed my name.

HENRY E. WEBER. 

